Designation:D3267−20StandardTestMethodforSeparationandCollectionofParticulateandWater-SolubleGaseousFluoridesintheAtmosphere(FilterandImpingerMethod)1ThisstandardisissuedunderthefixeddesignationD3267;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethodprovidesaprocedureforseparationandcollectionofparticulateandwater-solublegaseousfluo-ridesfromtheatmosphereonachemicallytreatedfilterandinanimpinger.Thesamplingratemayvaryfrom30L⁄min(1.0ft3/min)to15L⁄min(0.5ft3/min)forlongersamplingperiodsdependingontheatmosphericfluorideconcentration.Thistestmethodisnotintendedtobeappliedtogaseousfluorinecompoundsthatarenotwater-soluble.1.2Thereareseverallimitationsofthetestmethod:1.2.1Althoughtheacid-treated,mediumretentive,prefilterhasbeenshowntoallowpassageofHF,itrestrictspassageofparticulatematteronlyassmallasabout1µm.Thus,smallerparticulatemattermaypassthroughthefilterandbecollectedinorpassthroughtheimpingers.1.2.2Themaximumsamplevolumetobetakenusingthistestmethodpriortochangingtheacid-treatedprefilterisrecommendedas12m3.Thisrecommendationismadetominimizeanyeffectsduetoparticulatematterbuild-up.1.3ThevaluesstatedinSIunitsaretoberegardedasstandard.ThevaluesgiveninparenthesesafterSIunitsareprovidedforinformationonlyandarenotconsideredstandard.1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafety,health,andenvironmentalpracticesanddeter-minetheapplicabilityofregulatorylimitationspriortouse.Forspecificprecautionarystatements,see7.4.3.1.5Thisinternationalstandardwasdevelopedinaccor-dancewithinternationallyrecognizedprinciplesonstandard-izationestablishedintheDecisiononPrinciplesfortheDevelopmentofInternationalStandards,GuidesandRecom-mendationsiss...
